The well stream enters the treater in the top gas separation section and strikes the inlet deflector. Centrifugal action, reduced velocity and retention time combine to allow the gas to separate form the liquid and flow upward through the mist extractor to the gas outlet.
Oil and water travel downward through the large internal conductor pipe and are released below the firebox. Free-water continues downward to be discharged from the bottom portion of the treater. Oil and entrained water are distributed by the spreader and rise around the firebox through the heated water section.
The increase in temperature breaks the emulsion resulting in small droplets of water coalescing into drops which enlarge in size and weight until they start settling downward to the water section. This settling action continues as the oil rises at minimum velocity through the full diameter settling section.
Clean oil at the top of the settling section spills over and travels through piping to the head operated dump valve. Water is removed from the bottom portion of the treater through an externally adjustable water siphon and head operated dump valve. Entrained gas which breaks out during the heating and retention cycle travels upward, combines with the cool incoming gas and is discharged through the gas outlet.
Two phase separators are utilized to separate the gas from the liquid in a well strem. This allows liquid free gas to be diverted to gas sales and/or to be utilized as fuel. Relatively gas free oil is then dumped to storage or to a treating system for removal of water.
Two Phase- Low Pressure
The wellstream enters the separator and immediately strikes the inlet deflector. This diverts the liquid and gas around in a circular pattern which tends to “throw” the heavier liquids to the shell of the separator where it travels downward to the liquid section. The gas expands and starts to travel upward at a low velocity which allows more and more heavier liquids to fall out. After adequate retention time, the gas goes through the wire mesh mist extractor for final scrubbing of the gas. The liquid section is sized to hold the liquid long enough for a maximum portion of the gas in solution to break out and travel up through the gas section. As liquid builds up in the bottom section of the separator it lifts a float which, through linkage, dumps the fluid by means of a mechanical dump valve. A baffle protects the float and reduces liquid turbulence.
Three Phase- Low Pressure Application
Operation is essentially the same as the two phase except that the separator has an internal inlet flume which carries the liquid down into the settling section. The three phase also has a larger liquid section allowing more retention time for the oil and water to separate. At the oil/water interface there is a pneumatic displacement type level control which actuates the water dump valve. The oil which rises is then dumped by a mechanical float operated oil dump valve. The capacity is a function of the gravity difference in the oil and water, and retention time. Oil and water must be present as free liquids. The three phase separator will not “break” an emulsified liquid stream.